AES Metal - The PRNG
Start AES Metal.
None of the onscreen settings affect the PRNG in any way, with the exception of the hardware / software acceleration button.
Internally it always uses a 256 bit key and the counter mode of operation.
Shift Clicking the Open button will cycle through the available sizes in the adjacent box.
Click the Save As button.
Navigate to where the file should be saved to, and type the name you want it saved as.
The filename will appear in the adjacent box.
Also, the Start button will turn green.
Click Start to begin.
Progress is shown.
When it has finished, click OK.